My father has a doserless n55 model at home: http://www.santos.fr/55.html
We use it everyday to grind a dozen espresso a day and it is really nice to use: grinds in 3sec, no clumping, no need to redistribute... it is much faster than the Cimbali Max I have at home and the taste is not so different. It is very silent since it only grinds 3sec and then you don't hear the twack twack thing of the doser. The only problem is its size, this baby is huge!
You can watch a video (not mine) here:
And yes, it is this fast!